Combination door-knob, door-bell, and burglar-alarm.



PATENTED APR. 25, 1905.

E. STEWART.

COMBINATION DOOR KNOB, DOOR BELL, AND BURGLAR ALARM.

APPLICATION FILED FEB. 12.1904.

Inventor.

Patented April 25, 1905.

UNITED STATES PATENT OFFICE.

ELMER STEWART, OF KANSAS CITY, MISSOURI.

COMBINATION DOOR-KNOB, DOOR-BELL, AND BURGLAR-ALARM.

SPECIFICATION forming part of Letters Patent No. 787,996, dated April 25, 1905. Application filed February 12, 1904. Serial No. 193,318.

To It]! whom, it may (Jo/worn.-

Be it known that I, ELMER SrmvAR'r, a citition of the interior mechanism located and concealed within. The collar which holds or sezen of the United States, residing at Kansas cures a portion of the mechanism immovable City, in the county of Jackson and State of Missouri, have invented certain new and useful Improvements in Combination Door-Knobs, Door-Bells, and Burglar-Alarms, of which the following is a specification.

My invention relates to improvements in the combination of a door-knob, a door-bell, and burglar-alarm in which the bell and its support and the mechanism which sounds the bell takes the place of an ordinary door-bell, be-

ing attached in such a manner that it also takes the place of and serves the same purpose as an ordinary door-knob, the bell being intended to indicate the presence of some one at the door, the mechanism of the combination being so adjusted that the movement of the exterior knob or handle for the purpose of releasing the latch, catch, or fastening to the door, shutter, or similar cover for an opening will operate the alarm and produce a sounding of the bell to indicate the opening or closing of the door or the movement of the latch, catch, or fastening.

The objects of my improvements are, first, to provide facilities for giving an alarm indicatingthe movement of a door latch, catch, or fastening; second, to so locate the bell that it may be most convenient to the latch or catch and at the same time not be in the way of the operation of the door when opening or closing or in any way mar the appearance of the door; third, to so locate the mechanism that it will be concealed from ordinary view; fourth, to so combine the bell with its parts that the combination may be substituted for an ordinary door-knob and for all intents and purposes be used as such in addition to performing its functions as a bell and an alarm disguised as a door-knob. These objects I obtain by the mechanism illustrated in the accompanying drawings, in which Figure 1 is a vertical view showing the exterior door-knob, the rod or bar extending from it to the interior combination door knob and bell, of which the bell and its support, which together form the interior knob, are shown in vertical section, permitting inspecl l l l l l which the axle M is the center.

is shown with the near diagonal upper section removed. Fig. 2 shows an end view of the combination-knob with the bell removed. The balance of the figures on the drawings are indicated by letters and show different individual parts, as will be further indicated and described.

Similar letters refer to similar parts throughout the drawings.

The knob A is secured to the bar B in any manner of securing or fastening any ordinary door-knob. The collar C holds or secures the narrow metallic band D in any manner that it will be immovable. The metallic band or wire D is of such strength and rigidness that the loop or stirrup formed at E will carry the small axle M, to which is secured the small toothed wheel F and the small metallic plate or band K. The axle M passes through bearings in the stirrup E, extending far enough or being long enough to carry securely the small metallic band or plate K. The small metallic band or plate K is secured at its central point e to the axle M in a manner to make plate K immovable except when the axle M moves. At each extremity of the plate K is attached a metallic ball L, the attachment being accomplished by means of the small hooks or rings f and it, which pass through the holes g and 2:

in the plate K. The movement of the plate K by virtue of the revolution of the axle M causes the balls L to swing round a circle of These balls L in their motion come in contact with the bell J at a point most near the line of their circuit and pass on in their motion, causing the bell-metal to vibrate and give forth sound. The bell J, of any design or shape on the exterior, has a projection 22; extending from its central in" side point. In the end of this projection m is a hole 4?, lined with female threads. These threads in (Z are to receive the screw I, and the projection 1/1, in addition to supporting the bell J, is also a nut which holds the toothed wheel G on the shoulder 5, which is at the head of the screw 1. The wheel G is a toothed Wheel having an opening (4 in center, which fits on the shoulder b and is held thereon and in place by the projection m, in which the female screw-threads screw onto the screw I. The teeth of the toothed wheel G go between and act upon the teeth of the toothed wheel F, causing the wheel F to move, revolving the axle M, producing the striking of the bell in the manner described by moving K L, &c. The screw I is so made that it will fit into the projection m in the threads provided in (Z to receive the threads cut on I. This screw performs the double service of holding the wheel G in place and supporting the bell J. The screw I is the end of a projection extending from the center of the cup H. The cup H completes the shape of the exterior of the combination-knob as established by the bell J and in combination with the bell J conceals, protects, and supports the mechanism within.

The combination of the bell J and the cup H being used as and serving the purpose of a door-knob disguises its functions as a bell and an alarm and aids in the concealment of the fact thereof. The shoulder b at the head of the screw I is to receive the wheel G, fitting the opening a in the center of G. The cup H is of metal, has a projection on the interior, of which the shoulderb and screw I are a part and serve the purposes described. The cup H has a projection '71, which serves the purpose of the stem of the knob and secures it to the rod or shaft B. The stem 72 covers only three sides of bar, being made with the opening is extending through the cup and out of the inner projection at Z. This open portion,

in addition to receiving the bar B, permits entrance of the metallic band D, which is of such size and construction that in its location it is not interfered with by reason of any movement of the knob sufficient to cause necessary movement of the latch, catch, or fastening.

By means of this stem n the combination-knob is connected with the bar B and through the agency of bar with the latch after the mannor of attaching, connecting, and securing any ordinary door-knob.

I am aware that prior to my invention bells have been made with mechanical arrangements for striking the bell concealed therein. I am also aware that mechanical means having a rotary movement have been used for strikinga hell. I am also aware that means for striking a bell on one side of a door by the turning of a knob or handle on the other side have been used. I therefore do not claim any such combination broadly; but

WhatI do claim, and desire to secure by Letters Patent, is

1. The combination of a stem of a door-knob, a bell attached to the stem of a door-knob, a

gear-wheel attached to said stem, a striking device connecting with said stem through said gear-wheel, a rose-plate 0, a striker-carrying arm D attached to rose-plate 0, the remainder of the mechanism rotatable relatively to this arm D, so that the striking device will be operated by turning the stem of the knob.

2. The combination of a bell secured to the stem of a door-knob, a gear-wheel attached to said stem,a strikingdevice, an opening through said stem, a fixed striker-carrying arm extending through said opening and upon which said striking device is secured, the striker-carry ing arm being fixed and immovable relative to the rotation of the balance of the mechanism, whereby when the stem of the knob is turned the bell will be sounded.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

ELMER STEWART.

Witnesses:

J omv D. ULoUcH, ERNEST CLIFTON MASON. 

